feat: add Yandex Cloud Lockbox secrets backend

[ImpressionableRaccoon]

This PR added support for Yandex Cloud Lockbox secrets backend to Yandex Cloud provider 😎

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[Taragolis]

I'm not familiar with with Yandex.Cloud and sdk so this is just some generic comments

[Piatachock]

Almost LGTM. Mostly nit-s, endpoint parameter is important tho.

[Piatachock]

LGTM from Yandex

[Taragolis]

My main concern about Connection ID into the Secrets Manager, see appropriate conversation

dismiss change request

[ImpressionableRaccoon]

I think it's ready to merge

[boring-cyborg]

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